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41647af74c
We cannot put blocking network I/O onto the worldgen threads, this will crash the server if it stalls
49 lines
2.3 KiB
Diff
49 lines
2.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <spottedleaf@spottedleaf.dev>
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Date: Fri, 24 Apr 2020 09:06:15 -0700
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Subject: [PATCH] Make CallbackExecutor strict again
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The correct fix for double scheduling is to avoid it. The reason
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this class is used is because double scheduling causes issues
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elsewhere, and it acts as an explicit detector of what double
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schedules. Effectively, use the callback executor as a tool of
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finding issues rather than hiding these issues.
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diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
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index 82ebf79bdcae552d6e4f5dc4b4c85da26eda356c..c0f0f952c5dcd43435e6deae0566757ed6290e80 100644
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--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
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+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
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@@ -168,17 +168,28 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
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public final CallbackExecutor callbackExecutor = new CallbackExecutor();
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public static final class CallbackExecutor implements java.util.concurrent.Executor, Runnable {
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- private final java.util.Queue<Runnable> queue = new java.util.ArrayDeque<>();
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+ private Runnable queued; // Paper - revert CB changes
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@Override
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public void execute(Runnable runnable) {
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- this.queue.add(runnable);
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+ // Paper start - revert CB changes
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+ org.spigotmc.AsyncCatcher.catchOp("Callback Executor execute");
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+ if (this.queued != null) {
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+ LOGGER.error("Failed to schedule runnable", new IllegalStateException("Already queued"));
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+ throw new IllegalStateException("Already queued");
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+ }
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+ this.queued = runnable;
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+ // Paper end - revert CB changes
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}
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@Override
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public void run() {
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- Runnable task;
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- while ((task = this.queue.poll()) != null) {
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+ // Paper start - revert CB changes
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+ org.spigotmc.AsyncCatcher.catchOp("Callback Executor execute");
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+ Runnable task = this.queued;
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+ if (task != null) {
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+ this.queued = null;
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+ // Paper end - revert CB changes
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task.run();
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}
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}
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